Poker Stars can't be your Number One if you can't play there! But I would put them at the top of my list. I also play at 888, and still have a bwin account, but haven't played there for a long time. I used to particularly like Victor Chandler, because I used to win a fair amount there! I started, though, on Littlewoods, which no longer exists, neither (of course) does Full Tilt, though Poker Stars imported my avatar across when Full Tilt finished .
I am in the UK, so have to play on Poker Stars UK - I think the reason the various governments insisted that
poker sites had to have a special site for their players (Spain was one, and I used to play on PokerStars.es when I lived there) was so that they could be sure of collecting the tax!